Press release

Renesas Electronics Ships First Plastic Packaged, Radiation-Tolerant PWM Controller and GaN FET Driver for New Space SmallSats

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Renesas Electronics Corporation (TSE:6723), a premier supplier of
advanced semiconductor solutions, today announced the space industry’s
first plastic-packaged, radiation-tolerant PWM controller and Gallium
Nitride (GaN) FET driver for DC/DC power supplies in small satellites
(smallsats) and launch vehicles. The ISL71043M single-ended current mode
PWM controller and ISL71040M low-side GaN FET driver are ideal for
isolated flyback and half-bridge power stages, and motor control driver
circuits in satellite buses and payloads. Private ‘new space’ companies
have begun launching smallsats to form large constellations operating in
multiple low Earth orbit (LEO) planes. Smallsat mega-constellations
provide global broadband Internet links, as well as high-resolution
Earth observation imaging for sea, air, and land asset tracking.

The ISL71043M PWM controller provides fast signal propagation and output
switching in a small 4mm x 5mm SOIC plastic package, reducing PCB area
up to 3x compared to competitive ceramic packages. In addition, the
ISL71043’s 5.5mA max supply current reduces power loss more than 3x, and
its adjustable operating frequency — up to 1 MHz — enables higher
efficiency and the use of smaller passive filter components. The
ISL71043M and ISL71040M are characterization tested at a total ionizing
doze (TID) of up to 30krads(Si), and for single event effects (SEE) at a
linear energy transfer (LET) of 43MeV•cm2/mg. Both devices
operate over an extended temperature range of -55°C to +125°C.

The ISL71040M low-side GaN FET driver safely drives Renesas’ rad-hard
GaN FETs in isolated topologies and boost type configurations. The
ISL71040M operates with a supply voltage between 4.5V and 13.2V, a gate
drive voltage (VDRV) of 4.5V, and it includes both inverting and
non-inverting inputs. The device’s split outputs adjust the turn-on and
turn-off speeds, and its high current source and sink capability enables
high frequency operation. The ISL71040M ensures reliable operation when
driving GaN FETs by precisely controlling the gate driver voltage to
+3/-5% over temperature and radiation. It also includes floating
protection circuitry to eliminate unintentional switching.

“The ISL71043M and ISL71040M along with our GaN FETs and digital
isolators give customers a size and cost optimized power supply solution
for large constellations of smallsats,” said Philip Chesley, Vice
President, Industrial Analog and Power Business Division, Renesas
Electronics Corporation. “Renesas’ radiation-tolerant plastic package
flow and cutting-edge IC technology provides the optimal cost and
radiation performance new space customers demand for 5-year mission
profiles in low Earth orbit.”

Key Features of ISL71043M PWM Controller

  • Operating supply range of 9V to 13.2V
  • 5.5mA (max) operating supply current
  • ±3% current limit threshold
  • Integrated 1A MOSFET gate driver

    • 35ns rise and fall times with 1nF output load
  • 1.5MHz bandwidth error amplifier

Key Features of ISL71040M Low Side GaN FET Driver

  • Operating supply range of 4.5V to 13.2V
  • Internal 4.5V regulated gate drive voltage
  • Independent outputs to adjust rise and fall time
  • High 3A/2.8A sink/source capability

    • 4.3ns rise/3.7ns fall times with 1nF output load
  • Internal undervoltage lockout (UVLO) on the gate driver

The ISL71043M PWM controller and ISL71040M GaN FET driver can be
combined with the ISL73024SEH
200V GaN FET or ISL73023SEH
100V GaN FET, and ISL71610M
passive-input digital isolator to create a variety of power stage


The ISL71043M radiation-tolerant PWM controller is available now in an
8-lead 4mm x 5mm SOIC package, and the ISL71040M radiation-tolerant
low-side GaN FET driver is available in an 8-lead 4mm x 4mm TDFN package.

For more information on the ISL71043M, please visit:
more information on the ISL71040M, please visit:

Watch the video “Radiation-Tolerant
Plastic-Package ICs Overview
” to learn more.

(Note) Renesas branding policy will continue to apply the Intersil brand
for military and aerospace products.

About Renesas Electronics Corporation

Renesas Electronics Corporation (TSE:
) delivers trusted embedded design innovation with complete
semiconductor solutions that enable billions of connected, intelligent
devices to enhance the way people work and live. A global
leader in microcontrollers, analog, power, and SoC products, Renesas
provides comprehensive solutions for a broad range of automotive,
industrial, home electronics, office automation, and information
communication technology applications that help shape a limitless
future. Learn more at

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